JPH0549767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method for connecting a sheet functioning as a drainage material and a bracing material to the back side of a concrete structure.

<Conventional technology> As a construction technology for earth and sand for concrete structures such as retaining walls and bridge abutments, a plurality of water-permeable sheets are buried horizontally in backfill earth and sand on the back side of the concrete structure. There are various reinforcement methods that actively drain and reinforce backfill soil.

These construction methods are not only aimed at simply reinforcing backfilling earth and sand, but also by making use of the frictional resistance between the sheet buried underground and the earth and sand to make the sheet function as a backing material for concrete structures. This construction method also aims to reduce the earth pressure that acts on concrete structures.

<Problems to be Solved by the Present Invention> The following problems exist in the technology for constructing concrete structures using the above-described sheet.

In other words, conventional methods for integrating a sheet and a concrete structure include creating a recess in the back of the concrete structure and inserting the sheet into this recess to connect the sheet, or attaching various connectors to the concrete structure. It was installed on the side to connect the sheets.

Therefore, when manufacturing a concrete structure, it is necessary to attach a connecting tool for connecting the sheets and to process the connecting portion, which is a problem in that it is time-consuming.

Furthermore, when constructing retaining wall blocks by stacking them, attempts have been made to interpose sheets between each retaining wall block, but it is difficult to firmly connect the retaining wall and the sheet.

<Object of the present invention> The present invention has been made in view of the above points, and its purpose is to provide a method for connecting a sheet to the back of a concrete structure, which has excellent workability and can be easily connected. It is about providing.

<Structure of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings, but first, a formwork for pouring concrete will be described.

<A> Formwork Two types of formwork are used in constructing concrete structure 1.

One of them is an outer formwork 2 for constructing the outer surface of the concrete structure 1, as shown in FIG. 3, and a known formwork can be used as this outer formwork 2.

The other is an inner formwork 3 made of wood or steel, which is constructed on the inner surface of the concrete structure 1, as shown in FIGS.

The inner formwork 3 has ribs 3 on the periphery of the horizontally long formwork surface 32.
Rib 3 formed by projecting 1 and positioned in the horizontal direction.
A cushioning material 5 such as a rubber plate is attached to the entire outer surface of the housing 1.

Further, a plurality of mounting holes 33 are formed in the plate surface of the rib 31 to which the cushioning material 5 is attached.

Furthermore, a hook 34 is provided protruding from the back side of the formwork surface 32 for guiding a flap material such as a steel pipe.

<B> Sheet The sheet 4 has water permeability and high strength, such as a nonwoven fabric, a fibrous material whose main component is thermoplastic fiber such as polyamide, polyethylene, polypropylene, polystyrene, or a network or string thereof. or composites thereof can be used.

<C> Construction method (1) Framing the formwork and clamping the sheet (Fig. 2) The outer formwork 2 and the inner formwork 3 are placed facing each other to form the frame.

At this time, the near ends of the sheet 4 are inserted and held between the horizontal ribs 31, 31 of the inner formworks 3, 3, respectively.

That is, the ribs 31, 3 located in each horizontal direction
The end of the sheet 4 is inserted between 1 and fastened with bolts 6 and nuts 7.

As a result, both sides of the sheet 4 are sandwiched between the ribs 31 with the cushioning material 5 interposed therebetween.

Therefore, even if the sheet 4 is subjected to tension or bending during work, the cushioning material 5 buffers these external forces, thereby preventing damage to the sheet 4.

Further, the tip of the sheet 4 is fixed to a reinforcing bar or the like installed in the space surrounded by both the formworks 2 and 3.

Further, after the flap materials are successively inserted into the hooks 34 of each group of 3 inner forms, the hooks 34 and the flap materials are fixed with clamps to integrate each inner form 3.

Incidentally, in order to arrange fasteners such as U-clips and flap materials used when constructing the inner formwork 3, openings are opened at corresponding positions in the sheet 4.

(2) Concrete pouring (Fig. 3) Concrete structure 1 is constructed by pouring concrete 8 into formworks 2 and 3 framed in the manner described above.

As a result, the sheet 4 exposed inside both formworks 2 and 3
The end portions are buried in the concrete 8 and are firmly connected to the concrete structure 1 in an integral state.

After a predetermined curing period has elapsed, both formworks 2 and 3 are demolded.

(3) Embankment work (Figure 1) Roll up each sheet 4 that is integrally connected to the concrete structure 1, roll it out to the back side of the concrete structure 1 starting from the lowest sheet 4, and lay it alternately with the embankment 9. do.

As a result, each sheet 4 is horizontally arranged and buried within the embankment 9.

<Other Examples> In the above example, the case where the embankment is performed after the concrete structure 1 in which the sheet 4 is buried is completed prior to the embankment has been described, but the construction work of the concrete structure 1 and the embankment work are It is also possible to construct in parallel in multiple steps.

In the case of this embodiment as well, the sheet 4 is sandwiched between the inner forms 3 and buried in the concrete 8 in the same manner as in the previous embodiment.

Further, if the sheets 4 arranged horizontally and buried in the backfill earth and sand are interposed with sheets of the same quality in the vertical direction to give continuity to each sheet 4, drainage performance will be better.

<Effects of the present invention> The present invention has the following unique effects.

(a) Concrete pouring allows construction of concrete structures and sheet connection work to be performed at the same time;
Construction period can be shortened.

(b) The work to connect the sheet to the concrete structure is as simple as sandwiching one end of the sheet between the formwork during the assembly of the formwork, and the sheet is connected to the concrete structure. There is no need to use special tools or perform any additional independent work.

Therefore, it is possible to save labor.

(c) Since the sheet is sandwiched between the forms via cushioning material, it is possible to prevent the sheet from being damaged during work.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
An explanatory diagram of the inner formwork, FIG. 3: An explanatory diagram of the sandwiched state of the sheet.

Claims (1)

[Scope of Claims] 1. A concrete structure is constructed by pouring concrete on site, embankment is placed on the back of the concrete structure, and a sheet functioning as a drainage material and a retaining material is placed horizontally in the embankment. In the method of connecting to the back of a concrete structure, when assembling formwork according to the shape of the concrete structure, one end of the sheet is positioned in the formwork space, and a part of the sheet is placed as a buffer between the upper and lower formworks. A sheet characterized by comprising a step of temporarily fixing the sheet by sandwiching the sheet through a material, and a step of constructing a concrete structure in which one end of the sheet is buried by pouring concrete in the formwork. How to connect to the back of a concrete structure.